Coreless Brushless DC Motor 15mm to 30mm High Power Density- Suzhou Retek Electric Technology Co., Ltd.

Coreless BLDC Motor: The Ultimate in Compact, Long-Life Dynamics

The Coreless Brushless DC Motor (15mm to 30mm diameter) is the evolution of the coreless design, replacing the brushes and commutator with electronic commutation (typically external Hall sensors or sensorless control).

This motor combines the two most desirable features for micro-actuation: 1) The high power density and dynamic response (low inertia, zero cogging) of the coreless design, and 2) The extreme longevity and maintenance-free life of the brushless design. The most common configuration is the outrunner (or cup) design, where the permanent magnet cup rotates around the fixed coreless winding, providing exceptional torque for its size.

Introduction

Detailed Parameters and Performance Data

RETEK: Next-Generation Surgical and Aerospace Actuators

Suzhou Retek Electric Technology Co., Ltd. focuses on this series for mission-critical applications where size, weight, and lifespan are non-negotiable, such as high-end medical devices and miniature aerospace actuators. We specialize in precise rotor balancing and high-speed bearing selection to ensure the 50,000+ hour lifespan target is met. The sensorless version of this motor is popular for high-speed pumps and fans where low electromagnetic interference is essential.

Applications

Advanced Technology Highlights

Critical, Long-Life Applications for Coreless BLDC Motors

Surgical Robots and Instruments: Motors for minimally invasive surgical tools requiring high precision, smooth torque, and long sterilization cycles. Challenge: High reliability and precision in a compact, autoclavable design.
High-End Drones and UAV Propulsion: Motors requiring maximum power-to-weight ratio for flight duration and lift capacity.
Artificial Pump Systems (e.g., VAD): Motors for continuous, critical fluid movement requiring zero maintenance and high efficiency.
Industrial Micro-Inspection and Testing: Actuators for high-speed, long-life sorting and placement mechanisms.

Technical Specifications

Industrial & Commercial Usage

Technical Parameters (Coreless BLDC)

Parameter	Range / Typical Value	Unit
Diameter	15 to 30	mm
Rotor Inertia	Ultra-Low	g ⋅ cm$^2$
No-Load Speed	10,000 to 40,000+	RPM
Life Expectancy	50,000+ Hours	Limit by Bearings
Commutation	Electronic (Sensor/Sensorless)	Type

Additional Information

Supplementary Details & Notes

Integrated Production and Customization Workflow

Production includes extreme precision machining and assembly of the magnetic cup and shaft. All units undergo non-contact vibration testing at max operating speed.

Gearhead Integration: Offering the motor pre-assembled with a miniature, low-backlash planetary gearhead and customized output shaft.
Medical Sterilization: Providing versions manufactured with autoclavable/sterilizable materials and sealed bearings for medical instruments.
Sensorless Tuning: Pre-tuning the motor for specific sensorless controllers, maximizing efficiency and minimizing startup issues.
Integrated Encoder/Feedback: Providing external high-resolution absolute encoders mounted to the rear of the shaft for precise servo control.

Service & Support

Technical Advantages and Core Design Features

Brushless Longevity: Eliminates mechanical wear points, making the lifespan limited solely by the bearings.
Zero Cogging Torque: Provides exceptionally smooth and quiet torque output, even at very low speeds, ideal for fluidics and optical systems.
Highest Power Density: Achieves maximum force-to-size ratio due to the efficient coreless winding and rotating magnet cup geometry.
Precise Control: Easily controlled via modern digital drives (using PWM and Hall feedback) for excellent speed regulation and positioning.
Low EMI: Eliminates the electrical noise generated by brushes/commutator, crucial for noise-sensitive applications.

Frequently Asked Questions

Common Inquiries Regarding Coreless BLDC Motors

Q: How does the coreless BLDC motor generate torque?
A: The stationary winding creates a radial magnetic field. The rotating magnet cup is subjected to a Lorentz force perpendicular to this field, generating torque. The absence of an iron core allows the magnetic field to interact directly and smoothly with the magnets.

Q: Is an external driver required for coreless BLDC motors?
A: Yes. All BLDC motors require an external electronic drive (controller) to sequence the phase currents correctly (commutation) based on the rotor position (either via Hall sensors or sensing the Back-EMF).

Q: Can these motors be integrated with miniature gearheads?
A: Yes. For high-torque output, they are often paired with miniature high-precision planetary gearheads (e.g., 16mm or 22mm) to convert their high speed/low torque into low speed/high torque.

Resources

Advanced Material Selection Guide

Rotor Cup: Thin-walled, high-strength magnetic cup, often NdFeB-lined, used to maximize the flux density passing through the air-gap winding.

Bearings: Miniature, high-precision stainless steel ball bearings, often with ceramic balls for extreme speed or operating conditions (e.g., autoclavable or vacuum use).

Winding: High-temperature-rated copper winding with minimal resistance, optimized for I2R loss management.

About Suzhou Retek Electric Technology Co., Ltd.

Unlike other motor suppliers, Retek engineering system prevents the selling of our motors and components by catalogue as every model is customized for our customers. The customers are assured that every component they receive from Retek is designed with their exact specifications in mind. Our total solutions are a combination of our innovation and a close working partnership with our customers and suppliers.

As China Coreless Brushless DC Motor 15mm to 30mm High Power Density Manufacturers and Wholesale Coreless Brushless DC Motor 15mm to 30mm High Power Density OEM/ODM Suppliers, Retek business consists of three platforms: Motors, Die-Casting and CNC manufacturing and wire harness. Retek products are widely supplied for residential fans, vents, boats, airplanes, medical facilities, laboratory facilities, trucks and other automotive machines.

Welcome to send us an RFQ, it is believed you will get the best cost-effective products and services here!

Customized Solutions

Quality Assurance

Global Export

Suzhou Retek Electric Technology Co., Ltd.

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